RACK: Create a new list for segments.

RACK requires the segments to be in the order of their transmission
or retransmission times. This cl creates a new list and moves the
retransmitted segments to the end of the list.

PiperOrigin-RevId: 327325153

1 files changed, 11 insertions, 0 deletions

diff --git a/pkg/tcpip/transport/tcp/connect.go b/pkg/tcpip/transport/tcp/connect.go
index 290172ac9..87980c0a1 100644
--- a/pkg/tcpip/transport/tcp/connect.go
+++ b/pkg/tcpip/transport/tcp/connect.go
@@ -924,7 +924,18 @@ func (e *endpoint) handleWrite() *tcpip.Error {
 
 	first := e.sndQueue.Front()
 	if first != nil {
+		lastSeg := e.snd.writeList.Back()
 		e.snd.writeList.PushBackList(&e.sndQueue)
+		if lastSeg == nil {
+			lastSeg = e.snd.writeList.Front()
+		} else {
+			lastSeg = lastSeg.segEntry.Next()
+		}
+		// Add new segments to rcList, as rcList and writeList should
+		// be consistent.
+		for seg := lastSeg; seg != nil; seg = seg.segEntry.Next() {
+			e.snd.rcList.PushBack(seg)
+		}
 		e.sndBufInQueue = 0
 	}